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Department of Geophysical Engineering, Engineering Faculty, Istanbul University, Avcilar, Istanbul, Turkey
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- PublicationOpen AccessCrustal shear wave velocity structure of Turkey by surface wave dispersion analysis(2007-04)
; ; ; ;Tezel, T.; General Directorate of Disaster Affairs Earthquake Research Department, Ankara, Turkey ;Erduran, M.; Karadeniz Technical University Department of Geophyscial Engineering, Trabzon, Turkey ;Alptekin, Ö.;Boğazici University Kandilli Observatory,Çengelköy-İstanbul, Turkey; ; The shear wave velocity structure of the crust and upper mantle in Turkey was determined using single-station measurements of Rayleigh and Love wave group velocities in the 8-50 s period ranges. Group velocity dispersion data of fundamental mode constituted 19 paths for Western and 10 paths for Eastern Turkey. Dispersion curves are measured by applying the multiple filter technique to properly rotated three component digital seismograms. A differential inversion technique is applied to these group velocity dispersion data to determine the S-wave velocity structures of the crust and uppermost mantle. Our results show upper mantle S-wave velocities between 4.0-4.5 km/s, and a crustal thickness varying between 25-40 km from Western to Eastern Turkey.280 1704 - PublicationOpen AccessNumerical 2D modeling of site responsein Dinar Graben, Southwest Turkey,and comparison with observations(2005)
; ; ;Yalcinkaya, E.; Department of Geophysical Engineering, Engineering Faculty, Istanbul University, Avcilar, Istanbul, Turkey ;Alptekin, O.; Department of Geophysical Engineering, Engineering Faculty, Istanbul University, Avcilar, Istanbul, Turkey; The October 1, 1995 Dinar earthquake (ML=5.9) caused extensive damage within a limited area in Dinar town located in southwestern Turkey. Graben structure of the damaged area suggests the basin edge effects as a potential factor on the occurred damage. In this study numerical 2D site responses in the Dinar Graben are computed by using a finite-difference scheme and numerical results are compared with the observations within the graben. Our results suggest that the ground motions within the Dinar Graben were dominated by surface waves generated from the edges of the garben. In addition to magnifying amplitudes within the graben, the surface waves increased the duration of ground motion. Synthetic response spectra of the mainshock have shown that spectral accelerations at different sites in the graben are larger than the observed one. High spectral accelerations and long durations of ground motion may explain the extensive damage observed within the Dinar Graben.128 203